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A250531
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Number of (n+1)X(3+1) 0..3 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction
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1
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3958, 44017, 393910, 3091263, 21783369, 142934266, 885728348, 5269466799, 30337133947, 170444570767, 938858272263, 5094247207831, 27305253854913, 144985807285630, 763985644924271, 4002062352221853, 20864575519057800
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